I'm not sure why I like Gen3 shinies more, probably because I was never able to catch my own shiny on the main series games, the only shiny I ever caught on XD was a Zubat in the cave pokespot, I also think it could be because their rarer than RNG's and I'm not the biggest fan of those, but I could do it for just the Charizard

I try to trade for Gen3 game shinies more since I have oiv